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题库 / Prep2007E2-DS-74
If ~$x\neq -y$~, is ~$\frac{x-y}{x+y}> 1$~ ?
(1) x > 0
(2) y < 0
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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可不可以这样做呢：令x-y-(x+y)=x-y-x-y=-2y,由条件（2）y＜0，那-2y＞0，所以x-y＞x+y,分子大于分母，不就式子大于1了吗？为啥条件2不对呢？
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